package com.aurora.oa.utils;

import android.view.View;
import android.view.ViewGroup;
import android.widget.ListAdapter;
import android.widget.ListView;

/**
 * Created by Administrator on 2017/4/19 0019.
 */
public class ListViewUtil {

        public static void setListViewHeightBasedOnChildren(ListView listView) {
            //获取ListView对应的Adapter
            ListAdapter listAdapter = listView.getAdapter();
            if (listAdapter == null) {
                // pre-condition
                return;
            }

            int totalHeight = 0;
            for (int i = 0, len = listAdapter.getCount(); i < len; i++) {   //listAdapter.getCount()返回数据项的数目
                View listItem = listAdapter.getView(i, null, listView);
                listItem.measure(0, 0);  //计算子项View 的宽高
                totalHeight += listItem.getMeasuredHeight();  //统计所有子项的总高度
            }

            ViewGroup.LayoutParams params = listView.getLayoutParams();
            params.height = totalHeight + (listView.getDividerHeight() * (listAdapter.getCount() - 1));
            //listView.getDividerHeight()获取子项间分隔符占用的高度
            //params.height最后得到整个ListView完整显示需要的高度
            listView.setLayoutParams(params);
        }

}

